I'm trying to hook up my second phone line. I have a red, green and yellow wire in the cable, but no black wire. Is there a reason for this? And what can I do to get the second line up and running? thx
the wire you have is designed for 1 line only. Back in the day the yellow wire was used to carry ground because ground was necessary for old circuits. Ground is no longer needed so in order to get two lines you need at least a two pair wire (meaning four wires) you might have to run a new wire unfortunately or just keep that one and run another to separate jack.
